JPS59226556A - Reading device - Google Patents

Abstract

PURPOSE:To simplify change of filters by abutting a color filter against a stopper placed within the range of movement of a reading section. CONSTITUTION:When changing the color of a filter, a reading section 3 is moved from a reading range A by the distance B. The red part 8a of the filter is abutted to a side plate 10, and the reading part 3 is moved in the direction X until it comes into contact with a stopper 12. Then, the reading section 3 is moved to the reading range A and reading is performed. When changing the filter to transparent part 8b, the reading section 3 is moved in the direction X', and the transparent part 8b is brought into contact with the stopper 11. Then, the reading section 3 is moved within the reading range A and reading is performed. Thus, the filters can be changed simply.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an image reading device, and more particularly, to a reading device capable of arbitrarily switching between a plurality of color filters.

(Prior Art) In recent years, so-called image sensors in which at least one photoelectric conversion element is integrated into 11 packages have been widely used in reading devices such as facsimiles and OCR devices. Conventionally, most of these reading devices detect one-color images (mainly black and white originals). However, in the future, more and more reading devices will be able to extract or remove specific color components. Even today, there are reading devices that can distinguish between red and black, for example, and these devices can extract only the part of a document surrounded by a red frame, but this device detects the physical position of the red frame. This is achieved by However, since this discrimination between red and black is not the purpose of the present invention, it will be omitted.

Now, usually to detect a specific color component.

It has multiple color filters, and these color filters can be switched and used as appropriate. Conventionally, switching between color filters required a special drive source and a complicated switching mechanism.

(Objective) The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a reading device that can switch filters with a simple configuration without requiring a special drive source for switching filters. shall be.

(Embodiment) FIG. 1 shows a reading device according to an embodiment of the present invention, in which a reading section 3 is integrally mounted on a carriage (not shown) that moves along a pair of guide rails 1 and 2. There is. In front of the reading section 3, a document 4 held on a table (not shown) is placed parallel to the guide rails 1, 2. Drive wires 5 are fixed to both sides of the carriage, and the carriage and reading section 3 are integrally controlled to move along the document in the x and x' force directions by a pulley and a drive motor (not shown).

The reading section 3 is configured by housing a light source (not shown) for illuminating the original, a focusing lens 7, an optical filter 8, and an image sensor 9 in a housing 6.

The optical filter 8 is arranged in the moving direction (X) of the reading section 3.

It has a red part 8a and a colorless transparent part 8b in the X' force direction, and each part 8a, 8b can function as a filter.
It has lJ. The optical filter 8 is slidably fitted into a slit 6a formed in the housing 6, so that at least either the red portion 8a or the transparent portion 8b protrudes from the housing 6 to the outside. It has become.

Both ends of the guide rail 1.2 are supported by stepped side plates 10 and 11 that follow the outer shape of the casing 6 of the reading section 3, as shown in FIG. Stoppers 12 and 13 are fixed to the side plates 10 and 11, respectively, and as shown in FIG. 3, stoppers 12 and 13 abut against the carriage or casing 6 to determine their left and right end positions. Further, when the carriage or the housing 6 is in contact with the stopper 12 or 13, the left end or right end of the optical filter 8 is in contact with the side plate 10 or 11, and the transparent part 8b or the red part 8a of the optical filter 8 is in contact with the side plate 10 or 11. is alternatively located between the lens 7 and the image sensor 9.

Next, the operation of the embodiment having the above configuration will be explained.

In this embodiment, as shown in FIG. 2, the readable range A of the reading unit 3 is such that the red part 8a of the optical filter 8
0, the transparent part 8b contacts the lens 7 and the image sensor 9.
From the position indicated by the solid line located between
The transparent part 8b of 8 is in contact with the side plate 11, and the red part 8a is located between the position shown by the two-dot chain line between the lens and the image sensor.

When reading a document without changing the filter color, the reading unit 3 moves back and forth between the position indicated by the solid line and the position indicated by the two-dot chain line in Fig. 2, and reads the image information of the line. Each time, the document is fed by a predetermined amount in a direction perpendicular to the moving direction of the reading section 3 by a paper feeding mechanism (not shown). The above operations are repeated to read the entire document.

When it is necessary to change the color of the filter when reading a document, a control circuit (not shown) as shown in FIG.
νljl of the reading range B of the reading unit 3 than that of A? Move only A outward. Here, B is the readable range A of the reading unit 3
This is the distance from the left or right end position of the optical filter 8 to the point where the reading section 3 or the carriage comes into contact with the stopper 12 or 13.
is approximately equal to the center distance stiffness of.

For poems that are read by switching the optical filter 8 from the transparent part 8b to the red part 8a, the red part 8a of the filter is changed to
When the reading unit 3 or the carriage comes into contact with the side plate 10)
-/The reading section 3 is moved in the X direction until it comes into contact with the pad 12, and then the reading section 3 is moved within the readable range and reading is performed as described above.

When switching the optical filter 8 from the red part 8a to the transparent part 8b for reading, the transparent part 8b of the filter is brought into contact with the side plate 11, and the reading part 3 is rotated in the X direction until the reading part or the carriage comes into contact with the stopper 13. 'Move in the force direction. Thereafter, the reading section 3 is moved within the readable range and the document is read.

In this embodiment, the optical filter 8 and the reading section 3 (carriage) are moved out of the readable range, as described in ``2'' below.
Since the filters are switched by coming into contact with the side plates 10.11 and stoppers 12.13, respectively, there is no need for a dedicated drive source such as a solenoid, and the structure can be extremely simplified.

Note that the present invention is not limited to the above embodiments.

For example, as an optical filter, in addition to the one consisting of two parts, a red part and a transparent part, it may be made of three parts or more, such as a red part, a blue part, and a green part. In this case, each color can be switched by the reading part 3.
This is done by adjusting the amount of movement. Further, the recording head may be integrally held on the carriage holding the reading section 3.

(Effects) As described above, according to the present invention, a dedicated drive source is not required for switching the filter color, and the overall configuration can be extremely simplified.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, and FIGS. 2 and 3 are operation explanatory diagrams. 3---1 reading unit 4---1 original 7-111 lens 8-111 optical filter 9---
--Image sensor io, tt---One side plate 12.
13---Stopper x X'

Claims (1)

[Claims] A reading apparatus in which a reading unit having a plurality of color filters and an image sensor reads a document while moving, characterized in that the color filters are switched by abutting against a stopper arranged within a movement range of the reading unit. Device.